Display HTML Validation Errors in Visual Studio 2012

HTML Validation in Visual Studio 2012 can be customized for web development requirements and needs.
If you do not use external HTML validator to validate HTML editing for your web page, the best place to identify HTML5 validation or CSS validation errors is the markup editor, your development IDE Visual Studio 2012.

HTML validation is not only web developers but also important for web publishers too.

By default Visual Studio 2012 is not configured to catch and display missing closing tags as HTML validation error.
Missing HTML tags is one of basic HTML5 validation errors and is easy to catch using an external markup validator like W3C Validation Service.
But I prefer to detect them before deploying web project to internet or publishing content to my web site.

Of course, if you do not want to see HTML validation errors while programming in Visual Studio 2012 IDE, you can disable HTML5 validation errors using the same above HTML Editor options screen.
On the same HTML editor options configuration screen unmark or clear the Show error options.